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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185476
Search for the doubly charmed baryon Ξ+cc in the Ξ+cπ−π+ final state
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A search for the doubly charmed baryon Ξ+ cc is performed in the Ξ+ c π −π + invariant-mass spectrum, where the Ξ+ c baryon is reconstructed in the pK−π + final state. The study uses proton-proton collision data collected with the LHCb detector at a centreof-mass energy of 13 TeV, corresponding to a total integrated luminosity of 5.4 fb−1 . No significant signal is observed in the invariant-mass range of 3.4-3.8 GeV/c 2 . Upper limits are set on the ratio of branching fractions multiplied by the production cross-section with respect to the Ξ++ cc → (Ξ+ c → pK−π +)π + decay for different Ξ+ cc mass and lifetime hypotheses in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 2.5 to 25 GeV/c. The results from this search are combined with a previously published search for the Ξ+ cc → Λ + c K−π + decay mode, yielding a maximum local significance of 4.0 standard deviations around the mass of 3620 MeV/c 2 , including systematic uncertainties. Taking into account the look-elsewhere effect in the 3.5-3.7 GeV/c 2 mass window, the combined global significance is 2.9 standard deviations including systematic uncertainties.
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LHCb collaboration, et al. Search for the doubly charmed baryon Ξ+cc in the Ξ+cπ−π+ final state. Journal of High Energy Physics. 2021. Vol. 16, num. 2021, pags. 1-27. ISSN 1126-6708. [consulted: 23 of June of 2026]. Available at: https://hdl.handle.net/2445/185476